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Spectral filters used by PMI. Plotted are the solar spectrum around 617 nm (red; Fourier Transform Spectrometer (FTS) atlas; see Neckel & Labs, 1984), tunable filter profile (blue) and bandpass of the order-sorting prefilter (OSPF) (yellow). FSR denotes the free spectral range of the tunable filter; ΔλF and ΔλOSPF denote the full width at half maximum of the tunable filter and the OSPF, respectively.
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